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Share-Based Compensation (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Share-Based Payment Arrangement [Abstract] |  |  |  |
Fair value of share-based compensation awards, granted | $ 3.3 | $ 4.4 | $ 60.6 | $ 55.4
Unrecognized compensation expense, net of estimated forfeitures, for unvested share-based compensation awards outstanding | 94.3 |  | $ 94.3 |
Weighted average recognition period for unrecognized compensation expense (in years) |  |  | 1 year 8 months 12 days |
Share-based compensation expense | $ 15.4 | $ 12.3 | $ 29.3 | $ 23.5

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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